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fix(docs): more vchord details (#18435)

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* more details

* typo
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Matthew Momjian 2025-05-21 19:19:04 -04:00 committed by GitHub
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docs/docs/administration/postgres-standalone.md
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@ -80,11 +80,14 @@ The easiest option is to have both extensions installed during the migration:
2. Install `pgvector` (`>= 0.7.0, < 1.0.0`). The easiest way to do this is on Debian/Ubuntu by adding the [PostgreSQL Apt repository][pg-apt] and then running `apt install postgresql-NN-pgvector`, where `NN` is your Postgres version (e.g., `16`)
3. [Install VectorChord][vchord-install]
4. Add `shared_preload_libraries= 'vchord.so, vectors.so'` to your `postgresql.conf`, making sure to include _both_ `vchord.so` and `vectors.so`. You may include other libraries here as well if needed
5. If Immich does not have superuser permissions, run the SQL command `CREATE EXTENSION vchord CASCADE;` using psql or your choice of database client
6. Start Immich and wait for the logs `Reindexed face_index` and `Reindexed clip_index` to be output
7. If Immich does not have superuser permissions, run the SQL command `DROP EXTENSION vectors;`
8. Remove the `vectors.so` entry from the `shared_preload_libraries` setting
9. Uninstall pgvecto.rs (e.g. `apt-get purge vectors-pg14` on Debian-based environments, replacing `pg14` as appropriate). `pgvector` must remain install as it provides the data types used by `vchord`
5. Restart the Postgres database
6. If Immich does not have superuser permissions, run the SQL command `CREATE EXTENSION vchord CASCADE;` using psql or your choice of database client
7. Start Immich and wait for the logs `Reindexed face_index` and `Reindexed clip_index` to be output
8. If Immich does not have superuser permissions, run the SQL command `DROP EXTENSION vectors;`
9. Drop the old schema by running `DROP SCHEMA vectors;`
10. Remove the `vectors.so` entry from the `shared_preload_libraries` setting
11. Restart the Postgres database
12. Uninstall pgvecto.rs (e.g. `apt-get purge vectors-pg14` on Debian-based environments, replacing `pg14` as appropriate). `pgvector` must remain installed as it provides the data types used by `vchord`
If it is not possible to have both VectorChord and pgvecto.rs installed at the same time, you can perform the migration with more manual steps:
@ -129,11 +132,5 @@ ALTER TABLE face_search ALTER COLUMN embedding SET DATA TYPE vector(512);
Note that VectorChord itself uses pgvector types, so you should not uninstall pgvector after following these steps.
### Common errors
#### Permission denied for view
If you get the error `driverError: error: permission denied for view pg_vector_index_stat`, you can fix this by connecting to the Immich database and running `GRANT SELECT ON TABLE pg_vector_index_stat TO <immichdbusername>;`.
[vchord-install]: https://docs.vectorchord.ai/vectorchord/getting-started/installation.html
[pg-apt]: https://www.postgresql.org/download/linux/#generic